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[rahy-uh-lahyt] /ˈraɪ əˌlaɪt/
a fine-grained igneous rock rich in silica: the volcanic equivalent of granite.
Origin of rhyolite
1865-70; rhyo- (irregular < Greek rhýax stream of lava) + -lite
Related forms
[rahy-uh-lit-ik] /ˌraɪ əˈlɪt ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for rhyolite
  • rhyolite is what all these little chips are made of scattered on the ground.
  • The rock capping the mesa is an extrusive form of granite called rhyolite.
  • rhyolite is present as two distinct compositional and genetic types.
British Dictionary definitions for rhyolite


a fine-grained igneous rock consisting of quartz, feldspars, and mica or amphibole. It is the volcanic equivalent of granite
Derived Forms
rhyolitic (ˌraɪəˈlɪtɪk) adjective
Word Origin
C19: rhyo- from Greek rhuax a stream of lava + lite
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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rhyolite in Science
A usually light-colored, fine-grained extrusive igneous rock that is compositionally similar to granite. It often includes flow lines formed during the extrusion.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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